Grease gun



June 1, 1.937. c. F. GODDARD GREASE GUN Original Filed March 26, 1928V INVENTOR F Dfrfassn 6 oyggMsnP/Jm.

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ATTORNEY Reued June 1, 1937 UNITED STATES PATENT OFFICE GREASE GUN x Charles F. Goddard, deceased, late of Denver,

Colo., by Francis M.

Goddard, administrator,

Denver, Colo., assigner, by mesne assignments, to The Lubrication Corporation, Chicago, Ill., a corporation of Delaware Original N0. 1,787,783,

dated January 6, 1931,

Serial No. 264,940, March 26, 1928. Application for reissue Nove 644,924

40 Claims. I

another may be immediately'applied in the place thereof.

Another object of the invention is to provide, 15 in a. grease gun, a very simple means for ejecting the lubricant from the reservoir by means of compressed air or other pressure fluid.

A further object is to provide a gun which elects the lubricant in measured quantities according to the requirements of the machine part to be lubricated, and still other objects reside in details of construction and noveland useful arrangements and combinations of parts as will fully appear in the course of the following description.

In the accompanying drawing in which like characters of reference designate corresponding parts throughout the views,

Figure 1 represents a sectional elevation of a 30 grease gun constructed in accordance with the invention, a portion thereof having been broken away for lack of space,

Figure 2, an end view of the gun, looking in the direction of the arrow A in Figure l, Figure 35 3, a section taken on the line 3 3, Figure 1,

Figure 4, a section taken along the line 4 4, Figure 1, and Figure 5, an enlarged fragmentary section on the line 5 5, Figure 2.

40 Referring further to the drawing', vthe gun comprises a stock 5 provided with a curved seat i for the support of the reservoir 1. l

The stock carries the operative parts of th gun proper together with means for connecting 45' said parts with the reservoir, and it is further associated with a source of uid under pressure, and with hand controlled devices for connecting the source with the grease-rejecting element of the gun.

vThe stock is enlarged at its forward end 'to provide a cylindrical piston chamber 8 which is closed by means of a head 9 that has an air vent 54. The head has a plunger chamber I of smaller diameter in coaxial relation with the 55 piston chamber while a duct I2, connecting with mber 29, 1932, Serial No.

(Cl. {B21-47.3)

the interior of a coupling member I3, is adapted toconnect the plunger chamber witheither the reservoir or a machine part to which the gun is applied.

The coupling at one end of its interior passage has a. packing gland I4 adapted to admit a nipple I on the reservoinas will hereinafter be described, and the flow of lubricant through said passage between the nipple and the duct, is controlled by a check valve I6. The valve is preferably a ball form and is normally held in enabuts against a hollow screw gland I8 at the outer end of the coupling.

A second check valve I9 may be employed to control the passage of lubricant from the duct I2 to a machine part to which the coupling is applied, but this second valve is not positively essential in the operation of the gun and may be omitted.

Fitted for reciprocation in the piston chamber, is a piston ZIJ, with which is associated a plunger 2I tted for reciprocation in the plunger chamber. A stufng box22 at the end of the small cylinder III, prevents leakage of lubricant around the plunger into the larger cylinder B.

A coiled spring 23 returns the connected pistons to their normal position after each ejective movement. It will be apparent that the pressure pump thus produced operates on the principle of a hydro-static press to the extent that it involves an element having differentiated areas, ,one of which is subject to Iiuid vpressure for the exertion of a correspondingly multiplied pressure by the other.

At the other end of the stock5 is a socket 24 which, atv its outer end, is provided with a packing gland'v 25,` to admit another nipple 26 on the reservoir I. threaded plug 2I which defines a valve chamber 28, and which provides a valve seat 29 in connection with a central passage 30.

A valve 3|, preferably of spherical form, is mounted on a stem 32 which moves through the passage of the screw-plug. The end of the stem, at the opposite end of the plug, has a. head to be engaged by the end of the nipple 26, and a coiled gagement with its seat II by a coiled spring that v The socket is partitioned by a' spring 33' in the valve chamber, holds the valve the valve chamber of the socket 24 to'the piston chamber 8, is normally obstructed by a valve 35,

which is held in place against a valve seat 36 by a coiled spring 31. The valve 35 has a stem provided with an exhaust valve 38. The exhaust valve is engaged by a trigger 33 pivoted on the stock, as at 4U.

has a nipple 4| for its connection with a source' of pressure fluid, the connection being usually established by medium of a flexible conduit 42.

The reservoir 1 consists of a cylindrical container normally supported upon the seat 6 of the stock. The container is`closed at its ends by heads 43 and 44, and these heads carry the before mentioned nip-ples 26 and I5, which consist of short screw-threaded tubes tapered at their ends to facilitate their insertion through the packing glands 25 and I4, at the ends of the stock. A free floating piston 45, in the container, divides the latter into anair chamber 46 and a lubricant chamber 41.

When the container is in its operative position with relation to the pump element, its nipples extend through the packing glands to connect the air chamber 46 and the lubricant chamber 41, respectively, with the socket 24 and with the coupling I3. The container in this position is fastenedin place by two latch bars 48, which embrace the head at the lower edge thereof, as shown in Figure 2, and which are held in contact with the yhead by a toggle lever 49, an arm 50 of which engages with studs 5|, at the ends of the bars. The bars are slidably held in correspondingly formed slide ways at the rear end of the stock.

In the operation of the grease gun, a reservoir whose lubricant chamber 41. has previously been supplied with a lubricant, is fastened upon the seat 6 of the stock by means of the latch bars 48. In this position, the nipple -on the head 43 of the reservoir, extends through the packing gland 25 into the socket 24 and the nipple I5, at the opposite end of the reservoir, extends through the packing gland I4 into the hollow coupling member I3 of the head 9 of the piston cylinder 8 on the stock 5.

The nipple 26, by engagement with the stem 32, has separated the valve 3| from its seat, thereby establishing a constantly open connection between the source of pressure fluid and the air chamber 46 of the barrel. The valve 35 normally engages its seat to obstruct the passage of air from the source to the piston chamber 8, through the duct 34, and the large piston 20 and the therewith connected smaller piston 2|, are held at the ends of their respective chambers by the spring 23.

`The valve I6, in the coupling, normally held to its seat by the spring I1, obstructs the connection.

betweenthe duct I2 and the lubricant chamber 41 of the container, it being understood that the duct I2 and the small piston chamber ID, have been filled with a portion of the lubricant from the reservoir during a preceding operation of the gun. The piston chamber measures the quantity of lubricant that can; at one time, be fed to a machine part to which the gun is applied.

The gun, in its operative condition, is attached to the source of air under pressure, kby the conduit 42, and it is held in the hand of the operator who inserts his fingers through the finger opening 52 of the stock .5. After thecoupling member I3 has been connected by any suitable means to the machine part to be lubricated, the operator presses against the trigger 39, which projects in one o-f the finger openings, and thereby opens the valve 35 and closes the valve 38 in the duct 34. This establishes the communication between the source of pressure fluid and the piston chamber 8, with the result that the large piston 20 is driven forwardly against the resistance of the spring 23. .y

The plunger 2| moving in conjunction with the larger piston, now drives a quantity of lubricant, measured by the content of the small piston chamber, out from the duct I2 to the machine part to which the coupling member has been applied. When the trigger 39 is released, the spring 31 closes the valve 35, shutting oi the supply of uid pressure in the duct 34, and opens the valve 38, allowing the fluid pressure in the cylinder 8 to exhaust into the atmosphere, while the spring 23 returns the pistons to theirY original position.

The lvoid created in the small piston chamber, and the duct I2, by the discharge of the lubricant to the machine part, is now filled by the passage of a corresponding portion of the contents of the lubricant chamber of the container past the valve I6 into the couplingmember, it being apparent that the lubricant in the container is constantly under pressure by the air admitted past the valve 3| and 'through the nipple 26, to the floating piston 45.

The gun is now again in condition for another operation and the operations'may be repeated until the lubricant chamber of the container is entirely exhausted. When this occurs the container is removed from the stock by loosening the latch bars 48, and withdrawing the nipples from their respective glands which obviously is easily accomplished by sliding the container rearwardly along its seat on the stock. As soon as the container is demounted, the valve 3| is moved to its seat by the pressure of the spring 33, thereby preventing the escape of air.

Another container, previously lled with lubricant, is now mounted on the stock to replace the empty one, and the operator, by keeping a number of lled containers in reserve, may thus continuously feed alubricant to the parts of an au' tomobile, or other machine, as long as his supply of containers lasts.

Having thus described the improved grease gun, it is desired that variations in the construction and arrangement of the essential elements and parts thereof may be resorted to Without departing from the scope of the invention.

'Ihe invention claimed isrl 1. A grease gun comprising a stock, a lubricant ejecting element on the stock, a demountable container on the stock, a piston dividing the container into a lubricant chamber and a pressure chamber, a valve controlled connection between the lubricant chamb'er and the ejecting means, and valve controlled means connecting the ejection element with a source of pressure fluid and connecting the source of pressure and the pressure chamber, the said connections including nipples on the container, in sliding relation to the stock.

2. A grease gun comprising a stock, a lubricant ejecting element on the stock, .a demountable container on the stock, a piston dividing the container into a lubricant chamber and a pressure chamber, a valve controlled connection-between the lubricant chamber and the ejecting means, valve controlled means connecting `the ejecting element with a sourceof pressure fluid, and valved connecting means between the source of pressure and the pressure chamber, the said connections including packing glands on the stockand nipples on the container in sliding relation to the packing glands.

3. A grease gun comprising a stock, a demountable container on the stock, a piston dividing the container into a lubricant chamber and a pressure chamber, a lubricant ejecting element on the stock, including piston chambers of diilerent diameters, connected pistons in the chambers, a coupling member on the stock in valve controlled connection with the smaller piston chamber, means on the stock for connecting the larger piston chamber with a source of pressure iluid, including a hand controlled valve, a valve controlled socket connected with the source of pressure and nipples on the container for connecting its chambers with the coupling and with the socket, respectively.

'4. A grease gun comprising a stock, a demountable container on the stock, a piston dividing the container into a lubricant chamber and a pressure chamber, a lubricant ejecting element on the stock, a coupling member on the stock in valve controlled connection with the ejecting element, means on the Stock for connecting the ejecting element with a source of pressure uid, including a hand controlled valve, a valve controlled socket, connected with the source of pressure, and nipples on the container pling and with the socket, respectively.

5. A grease gun comprising a stock, a de-` mountable container on the stock, a piston dividing the container intoa lubricant chamber and a pressure chamber, a lubricant ejecting element on the stock, a coupling member on the stock in valve controlled connection with the ejecting element, means on the stock for connecting the ejecting element with a source of pressure uid, including a hand controlled valve, a valve controlled socket connected with the source of pressure, and nipples on the container for the connection of its chambers with the coupling and with the socket, respectively, the nipple cooperating with the socket, controlling tne position of the respective valve to open the same when the container is in place on the stock,

6. A grease gun comprising a` stock, a demountable container o n the stock, a piston divviding the container into a lubricant chamber and a pressure chamber, a lubricant ejecting element on the stock, a coupling member on the stock in valve controlled connection with the ejecting element, means on the stock for connecting the ejecting element with a source yof pressure iluid, including a valve controlling spective valve to open the same when the container is in place on the stock.

'7. A grease gun comprising a stock, a demountable container on the stock, a piston dividing the container into a lubricant chamber and a. pressure chamber, a lubricant ejecting element on the stock in valve controlled connection with the lubricant chamber, means on the stock for its connection with a source of pressure fluid, including a ypassage to the ejecting element, and a socket, a hand moved valve controlling the passage, a spring pressed valve normally closing the socket against the escape of pressure iluid, and a nipple on the container connecting its pressure chamber with the socket, and engaging the valve to hold it oi its seat.

8. A grease gun comprising a stock, a removable grease container slidably mounted on the stock, a piston in the container for driving grease therefrom, nipples on the container at opposite sides of the piston, means on the stock for feeding pressure uid to one tof the nipples, ,to drive the piston, and mechanism connected with the other nipple for receiving and expelling grease driven from the container.

9. A grease gun comprising a stock, a removable grease container slidably mounted on the stock, a piston in the container for driving grease therefrom, nipples on the container pointing in the same direction and being at opposite sides of the piston, ttings on the stock into which the nipples are slid when the container is slid into position on the stock, and means on the stock for feeding air pressure to one fitting, and means for receiving and expelling grease passing through the other fitting.

10. A grease gun comprising a stock, a removable grease container thereon, the stock having a connection with the container to feed air pressure thereto, means to automatically close said connection, said means being rendered operative by removal of the container, and mechanism for expelling grease driven from the container by the air pressure.

11. A grease gun comprising a stock, said st'ock having a pressure line, a lubricant ejecting element on the stock, a demountable container on the stock the stock being outside of the container, movable means dividing the container into a lubricant chamber and a pressure chamber, a sliding connection between the lubricant chamber and the ejecting means, and a sliding connection between the pressure line and the pressure chamber.

12. A grease gun comprising a grease containe having an air inlet anda grease outlet, a stock outside the container, and sliding connections between the stock and said inlet and outlet.

13. A grease gun comprising a stock, a grease container on the stock, the stock being outside the container, the container having an air inlet and a grease outlet, an` air pressure line on the stock, and a sliding connection between the 4air inlet of the container and said air line.

14. A grease gun comprising a ldemountable container having a pressure inlet and a grease outlet and a stock outside of and separable from the container, the stock having slidingconnections with said inlet and outlet.

15. Lubricating apparatus comprising in com-l bination, a portable grease gunr and a plurality oi' lubricant containers each adapted for quick attachable-quick detachable connection with said gun, said apparatus, when the gun 'and a container are connected, comprising a stock, a grease container de tachably secured to said stock, an air actuated piston in said container for discharging grease therefrom, an air actuated pressure booster pump relatively permanently secured to said stock, a connection from said container to said booster pump whereby grease may be supplied from the container to the pump, a discharge connection from said pump, air passages through said stock for connecting a source of compressed air supply with said container and with said air actuated pressure booster-pump, and manual control means mounted on said stock for controlling the admission of air to said booster pump.

16. Lubricating apparatus comprising in combination, a portable grease gun and a plurality of lubricant containers each adapted for quick attachable-quick detachable connection with said gun, said apparatus, when the gun and a container are connected, comprising a stock, a grease container detachably secured to said stock, an air actuated piston inv said container for discharging grease therefrom, an air actuated pressure booster pump relatively permanently secured to said stock, a connection from said container to said booster pump whereby grease may be supplied from the container to the pump, a discharge connection from said pump, air passages v through said stock for connecting a source of compressed air supply to said container on the side of the piston opposite its side adjacent to the lubricant and to said air actuated pressure booster pump, and control means on said stock for controlling the admission of air to said booster pump.

17. A portable lubricant gun comprising a stock having provision for connection with a source of fluid pressure supply, a lubricant ejecting element including avfluid pressure operated motor in said stock, a lubricant container detachably secured to and portable with said stock, movable means dividing the container into a lubricant chamber and a chamber adapted to be put u nder iiuld pressure,'a quick'detachable fluid tight con'- nection between said lubricant chamber and said ejecting element, and means for putting the second said chamber under uid pressure.

18. A portable lubricant hand gun consisting of a combined power unit and lubricant supply unit comprising, a power unit including a fluid pressure operated motor and a lubricant pump driven by said motor, said piunp having a lubricant inlet and an outlet, and a lubricant supply unit including a container having a lubricant outlet, a piston in said container, and a quick attachable-detachable connection between said container outlet and said pump inlet.

19. A portable lubricant hand gun comprising, a lubricant container having a piston therein and a lubricant outlet at one end, a lubricant pump having a lubricant inlet and a lubricant outlet, a stock'carrying fluid pressure operated means for operatingl said pump, and a Vquick attachable-detachable connection between said container outlet and said pump inlet, said container being detachably supported by said stock.

20. A portable lubricant hand gun comprising, a stock, means for connecting said stock with a source of air under pressure, a lubricant container adapted to be secured to and carried by said stock on the outside thereof, said container having an air inlet Afor air under pressure from the stock and also having a lubricant outlet, and a quick attachabledetachab1e connection between said container and stock for at once securwhen the plunger is retracted and discharge them on a power stroke of the piston and plunger, and means for reciprocating the piston and plunger including means for admitting air under pressure behind the piston on its power stroke and into said chamber, the last said means including a hand trigger controlled opening and automatically closingvalve mechanism, said valve mechanisml normally venting air to the atmosphere from behind said piston when the trigger is released.

22. In a device of the character described, a barrel having a chamber for fluids, al floating piston in said chamber adapted. to press on said fluids, a power device comprising a power piston anda plunger, means cooperating with the plung- `er to receive fluids from said chamber when the plunger is retracted and discharge them on the power stroke of the power piston and plungen.

and means for reciprocating the power piston and plunger including means for admitting air under pressure behind both the power piston and the floating piston .in said chamber, the last said means including a hand trigger controlled opening and automatically closing valve mechanism, said valve mechanism normally venting air to the atmosphere from behind said piston when the trigger is released. v

23. In a portable lubricant hand gun consisting of a power unit and a lubricant supply unit, a lubricant container having a piston therein and Aa lubricant outlet at one end, said piston being adapted and arranged to force lubricant toward said outlet, means for pressing said piston against the lubricant, a stock, a fluid operated motor in said stock, a high pressure chamber for reception of lubricant from said container, a high pressure piston in said chamber, a connection between said motor and high pressure piston for driving the latter, and a quick attachable-detachable connection between said container and stock, said container and stock being independent units when detached from one another, said units mu tually supporting one another when connected.

24. A portable hand lubricant gun comprising, a stock adapted to be grasped by the'hand of the operator, a fluid pressure operated motor carried by said stock, a high pressure pump including a. high pressure cylinder carried by said stock and a plunger in said cylinder and secured to said motor, a lubricant supply chamber disposed alongside of and secured to said stock, said container and stock being disposed substantially parallel to one another along their length, a piston in said chamber, a lubricant outlet from oney end of said chamber connecting with said high pressure cylinder,l a fluid pressure inlet at the other end of said chamber for connection with a 'source of fluid pressure supply, an outlet from said high pressure cylinder, a check valve inl said outlet. a finger operated trigger controlled valve in said stock for controlling the admission of iiuid under pressure l being on the container Vand the other being se- Cal pressure to one connection, and means for 'rei-- ceiving and expelling grease passing through the cured to said stock, and means for latching said container and stock together with said members in sealing contact.

26. A hand portable grease 'gun comprising,

a stock, a lubricant electing iiuid operated pump secured to said stock, a lubricant container demountably connected with said stock, a piston in said container, a Valve controlled connection between one end of said container and the intake of said pump, said connection including a nipple member and a socket member, one of said members being on the container and the other on the stock, meansfor quick-detachably securing said members together, and valve controlled means for supplying fluid under pressure to said container behind said piston therein and to said pump for the operation thereof.

27. A grease gun comprising a stock, a removable grease container slidably mounted on the stock, a piston in the container for driving greasev therefrom, sealing means on the container at opposite ends thereof, said sealing means being directed in the same direction, and being adapted for engagement with cooperative sealing means on the stock, cooperative sealing means on the stock against which said sealing means on the container may be slid when the container is slid into position on the stock, each sealing means with its cooperative sealing means providing a quick attachable-detachable fluid tight connection, means onjthe stock for supplying a fluid und r other connection.

28. A grease gun comprising a stock, a removable grease container slidably mounted on the stock, a piston in the container, said container having an inlet for fluid under pressure behind said piston and an outlet aheadof said pistonv for ejection of grease from the container, sealing means about said inlet and said outlet for engagement with cooperative sealing means on the stock, cooperative sealing means on the .stock against which said sealing meanson the container may be pressed when the container is slid into position on the stock, each sealing means with its cooperative sealing means providing a quick attachable-detachable fluid tight connection, means on the stock for supplying fluid under pressure through said container inlet and behind said piston, and fluid pressure operated means for receiving and expelling under high pressure the fluid expelled from the outlet of said container.

29. A hand portable grease gun comprising, a stock having means for connection of an air pressure line, a grease outlet conduit on the stock, a lubricant container demountably carried by said stock, means insaid container movable longitudinally thereof and separating the grease and air therein, a, sealing nipple and socket connection between the grease end of said container and said grease outlet conduit, means for supplying air to the air side of said separating means from said air connection means, and means for detachably securing said stock and container together.

30. AIhand portable grease gun comprising, a. stock unit, a grease container unit removably mounted on thestock, an air-motor pump Aon the stock, said' container having a grease outlet, means .for subjecting the grease in said container Ito air pressure above atmospheric pressure, meanson the stock for connection of an air pressure line for 'supplying air to said vair motor and to said means for subjecting the grease to air pressure, and a nipple and socket' seal.

effecting connection between the grease outlet of the container and said pump.

31. A hand portable grease gun comprising, a stock unit and a grease container lunit on the stock, said container having a grease outlet and grease outlet conduit, lmeans for subjecting said follower and the grease in said container to air means on the stock for connection of an air presunder pressure above atmospheric pressure, and

sure line for supplying air against said follower and the grease in said container.

' 32. In a hand portable lubricant power gun of thecharacter described, a barrelhaving afloating piston therein, saidfloating piston being adapted to divide said barrel into a lubricant reservoir and an air chamber, a stock, an air conduit through said stock leading from a source ofcompressed air to said-air chamber, a valve in said conduit, a power device comprising a power piston and a plunger mounted in said stock, means cooperating with the plunger to receive lubricant from said`reservoir when the plunger is retracted and to discharge the lubricant on apower stroke of said powerpiston and plunger, and means foractuating said piston and plunger including means fo1 admitting air under pressure behind said power piston while air is being admitted .into said chamben, the last said means including a conduit connected with the .rst said conduit and a hand trigger operated thereby. said trigger valve normally venting air to the atmosphere from behind said power piston when the trigger is released.

33.'A p ower unit adapted to.be interchange-` ably connected with any one of a plurality of lubricating guns eachcontaining a lubricant expeller member, said power lunit carrying a motivating means therein arranged to effect actua- .ing motivating means therein for cooperation withV said e'xpeller member whereby the power unit may be employed for dispensinglubricant of diiferent guns to diiferent parts of a device to be lubricated, and a manual control for the ino- ,tivating means of said power unit.A

35. A power unit adapted to be interchangeably connected with portable lubricant guns having discharge nozzles and lubricant reservoirs, means for detachably connecting said power unit with saidA lubricant guns and said power unit having motivating means therein for eilecting the discharge of lubricant from the charge of grease, means for charging the holderv with grease, a pneumatically actuated piston having an ejector working in the holder to expel the charge therefrom when the piston is moved in one direction, a cylinder for the piston, a handle supporting 'the charging means, the holder and the cylinder, and means to permit air to be supplied to the cylinder to operate the piston andincluding a structure having an ex' haust port connecting the cylinder with the handle and the said handle being open at one pointto permit the exhaust air as it leaves the cylinder to-be discharged. therefrom.

38, A grease gun comprising a holder for a charge of grease, means' for charging the holder with grease," a pneumatically actuated piston having an ejector working in the holder to expel the charge therefrom when .the piston is moved in one direction, a cylinder for'the. piston, a handle supporting'the charging means, the holder and theacylinder, and meansk to permit air to be supplied to the cylinder to operate the piston andincluding a structure having an eg;- haust port connecting the cylinder with the handle, and the said handle beingv open at one point to permit the exhaust air as it leaves the cylinder to be discharged`I therefrom, the charging means including a cylindenfor containing grease, a piston operating therein, the cylinder of the charging means having a valved passage leading to the holder, and means connecting the cylinder of said charging means with the air supplying means to permit air from the latter to be 'delivered to the charging cylinder and to act upon the piston thereof.

39. A grease gun comprising, a body having a holder for a charge of grease, a cap on the body having a port leading to the holder, means for delivering a grease charge to the holder includ-Y ing a grease container having an end detachably connected to the cap, iluid pressure Vactuated means for delivering a charge from the container to the holder, uid pressure actuated mechanism for eje'cting a charge from the holder, means for supplying actuating fluid pressure to said uid pressure actuated means from a Huid pressure source, and means for supplying actuating fluid pressure from said source to the said ejecting mechanism.

i0. A grease gun comprising a -body member having ya .high pressure grease discharging cylinder, a fluid pressure actuated device car- 'ried by said body member for discharging grease from said cylinder, a detachable grease cartridge connected to said body member, a low 

